What an at-home EtG test shows
Most home tests are lateral-flow immunoassays. A line pattern indicates whether the sample is above or below the product's cutoff. Read timing, storage, and interpretation instructions exactly because faint-line conventions differ from many other tests.
What a laboratory adds
A laboratory can document collection, measure a numeric concentration, assess sample validity, and use mass-spectrometry confirmation. A lab report also states the method, units, and cutoff needed for interpretation.
Accuracy depends on more than the brand
- Correct storage and expiration date
- Cutoff level
- Sample concentration and creatinine
- Time since exposure
- Screening versus confirmation method
Choosing the appropriate test
A home screen may be useful for personal information, but it is not a substitute for professional testing in treatment, employment, supervision, or legal settings. Follow the policy of the organization requiring the test.
Evidence and limitations
This guide summarizes primary research and public-health guidance. Group-level findings cannot predict one person's result.